"Dan Hartung" wrote in message
...
The air hose connected to a propane-style air tank is hissing at the
screw threads. I've tried tightening the nut and nothing. I suppose I
should take it out and add some kind of sealant, but what? The tank
valve measures hundreds of pounds, but I have no idea what the tank is
really "good" for, and I never get it more than 100lb full (just about
what the 2-minute run time at the local Mobil gets me).

Teflon tape or plumbers dope on the threads.